Pesticides Flashcards
At what height can annual bluegrass be mowed and still produce seed?
1/8 inch
What can control annual bluegrass in most turfgrass sites
preemergence and post emergence.
what percentage of annual bluegrass control will preemergence herbicides control
80-90%
what are two groups of herbicide formulations
dry and liquid
Any additive used with an herbicide that enhances the performance or handling of the herbicide
Adjuvant
A material that allows the mixing or improves the suspension of two or more formulations when applied together as a tank mix
Compatibility Agent
oil based material that enhances herbicide penetration through the leaf cuticle
Crop Oil Concentrate
A material that eliminates or suppresses foam in the spray tank so that pumps and nozzles can operate correctly.
Defoamer
A material used in a liquid spray mixtures to reduce spray drift
Drift Control Agent
A material that improves the emulsifying, dispersing, spreading, wetting or other surface modifying properties of liquids.
Surfactant
A material that reduces interfacial tensions between water droplets and the leaf cuticle.
Wetting agent
what are two ways to spray that will help reduce the damage to non target plants when applying herbicide?
Shielded Sprays and Wiper Applications
which grass does not go completely dormant in Arkansas?
zoysiagrass
What are volatile liquids or gases that control a wide range of soil borne pests?
Soil Fumigants
What can be used to deactivate herbicides?
Activated Charcoal
What is the rate range for using activated charcoal for herbicide accidents?
100-400 lbs per acre. Rule of thumb, 200 lbs per acre.
When will a charcoal application not be effective?
If the herbicide has been moved into the soil due to rain or irrigation.
What are some common steps to weed prevention?
- Use weed free mulch and topdressing materials
- Use weed free seed
- Keep border areas weed free.
- Wash or blow equipment between uses.
Which Type of inhibitors are absorbed through foliage and inhibit cell division?
Type I
Which Type of inhibitors are generally root absorbed and suppress growth through interference with gibberellic acid synthesis?
Type II
What is an abnormal alteration in the structure and/or physiological function of a plant?
Plant disease
Diseases caused by an unfavorable growing enviroent
Abiotic
What makes up the disease triangle?
Casual Agent, Susceptible Host, Favorable Environment
what is the most common nematode?
root-knot
what is responsible for most turf grass disease in Arkansas?
fungi
What is a turf grass disease that cannot be controlled by chemicals?
SAD (St. Augustine Decline) caused by a panicum virus.
What is a way to control Take-All patch fungus?
Reduce thatch since it lives on plant debris.
